WilliamBos
Serial Post Whore in the making...
When I shift my 4L60 into tow/haul, does that lock the converter up?? Feels like it holds the sifts out longer. DOes it prevent from going into 4th(od)??
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Mileage question 1500 6.2 vs 2500HD 6.0??
- Thread starter WilliamBos
- Start date
When I shift my 4L60 into tow/haul, does that lock the converter up?? Feels like it holds the sifts out longer. DOes it prevent from going into 4th(od)??
btfarm
America First!
I don't know specifically about yours but T/H on the Allison locks the converter in 2nd. I imagine your is similar. I doubt if it locks out OD. It would just make it come in later. T/H wants you to shift at higher RPM so you don't fall so far below the torque curve peak when upshifting.
trouttrooper
Big Blocks ROCK!!!
On my '05 with the Allison 5 speed there is a significant increase in engine braking when I manually shift from 2nd to 1st. So much that I don't like shifting into 1st if I'm moving much at all, I don't like the clunking and shuddering as the truck gathers it's composure and settles into gear. I'll use the brakes to slow down to 5mph or so before shifting.
The '09 with the 6L80E. When I'm going downhill in the mountains I'll have it forced into 2nd going around 15mph, the steeper the grade the more I ride the brakes. When I force it to first gear I have 2 things happen. One the rpms skyrocket (duh), and two the truck will start speeding up. If I let it go back to 2nd the truck will start engine braking better and I'll slow down. I don't touch the gas at all during all of this. Even starting from a standstill, 2nd will hold the truck back better than 1st. All other auto tranny trucks I've driven weren't like this, 1st gear always had more engine braking capability than 2nd.
The '09 with the 6L80E. When I'm going downhill in the mountains I'll have it forced into 2nd going around 15mph, the steeper the grade the more I ride the brakes. When I force it to first gear I have 2 things happen. One the rpms skyrocket (duh), and two the truck will start speeding up. If I let it go back to 2nd the truck will start engine braking better and I'll slow down. I don't touch the gas at all during all of this. Even starting from a standstill, 2nd will hold the truck back better than 1st. All other auto tranny trucks I've driven weren't like this, 1st gear always had more engine braking capability than 2nd.